$server = 'xxx.xxx.xxx.xxx';
$user = 'user.....';
$pass = 'password...';

$port='1433';
$database = 'database...';

$connection_string = "DRIVER={SQL Server};SERVER=$server;PORT=$port;DATABASE=$database";
$conn = odbc_connect($connection_string,$user,$pass);
if ($conn) {
    echo "Connection established.";
} else{
    die("Connection could not be established.");
}